Visible-light-induced regioselective cross-dehydrogenative coupling of 2-isothiocyanatonaphthalenes with amines using molecular oxygen

Acyl Radicals from α-Keto Acids: Metal-Free Visible-Light-Promoted Acylation of Heterocycles

“…Because of the mild conditions, the photogeneration of acyl radicals has been an alternative to the previously mentioned traditional methods . With the irradiation of visible light, α-keto acids could be converted into acyl radicals for further transformations under mild conditions . However, in most cases, high-cost noble-metal-based photocatalysts or stoichiometric amounts of hypervalent iodine reagents were necessary (Scheme b).…”

Three-component reaction access to S-alkyl dithiocarbamates under visible-light irradiation conditions in water

“…Since Katritzky salts have been reported to act as alkyl radicals in C–C and C–heteroatom bond formation, we envisage that S -alkyl dithiocarbamates could be constructed indirectly starting from readily available aliphatic primary amines (Scheme 1c). As a part of our continuing studies on green chemistry and photoredox catalysis, 14 we herein report a new visible-light promoted multicomponent reaction for the formation of S -alkyl dithiocarbamates from Katritzky salts, CS 2 and secondary amines using water as the green solvent in the absence of transition metals or other photocatalysts (Scheme 1d). Compared with the traditional approach to S -alkyl thiocarbamates from aliphatic primary amines, our developed method has obvious advantages.…”

Sulfonylation of Aryl Halides by Visible Light/Copper Catalysis

“…Therefore, there is still ample room for innovation, and the development of alternative visible-light promoted strategies for the construction of organosulfones as supplements to the existing methods still remains very attractive. As a part of our continuing interest in photochemical transformations, we herein disclose a visible-light-promoted method for the synthesis of organosulfones from aryl halides and sulfinate salts using [(BINAP)­Cu­(NCMe)]­PF 6 ] generated in situ as the photocatalyst under mild conditions (Scheme d).…”